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The article discusses on the prevalent growth of two subspecies of weeds Lindernia dubia in a field in Japan. The emergence of sulfonylurea biotypes Lindernia dubia in Japan create an adverse effect in the rice production in the country. A herbarium study was conducted in the field to understand the growth of such weeds. The study revealed that the subspecies usually grow in some paddy fields particularly in Hokkaido to the Southern part of Kyushu in Japan and will diffuse more as it grows.